One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,11)(4,8)(5,9)(6,10)(7,13)(12,16)(14,15)(17,18)(19,29)(20,34)(21,26)(22,40)(23,43)(24,31)(25,36)(27,42)(28,39)(30,56)(32,62)(33,47)(35,68)(37,71)(38,67)(41,52)(44,51)(45,74)(46,76)(48,69)(49,72)(50,70)(53,58)(54,64)(55,61)(57,66)(59,77)(60,73)(63,75)(65,79)(78,80) involution — undirected(1,3,6,13)(2,7,10,11)(4,12,5,14)(8,15,9,16)(17,19,21,31)(18,24,26,29)(20,30,35,57)(22,32,38,60)(23,33,39,61)(25,45,48,53)(27,46,50,54)(28,47,43,55)(34,66,68,56)(36,58,69,74)(37,59,44,65)(40,73,67,62)(41,63,72,80)(42,64,70,76)(49,75,52,78)(51,77,71,79)(1,4,6,5)(2,8,10,9)(3,12,13,14)(7,15,11,16)(17,20,21,35)(18,25,26,48)(19,30,31,57)(22,41,38,72)(23,44,39,37)(24,45,29,53)(27,51,50,71)(28,52,43,49)(32,63,60,80)(33,65,61,59)(34,67,68,40)(36,70,69,42)(46,77,54,79)(47,78,55,75)(56,73,66,62)(58,76,74,64)(1,5,6,4)(2,9,10,8)(3,12,13,14)(7,15,11,16)(19,31)(24,29)(30,57)(32,60)(33,61)(45,53)(46,54)(47,55)(56,66)(58,74)(59,65)(62,73)(63,80)(64,76)(75,78)(77,79)(2,10)(7,11)(8,9)(15,16)(18,26)(19,31)(25,48)(27,50)(28,43)(30,57)(32,60)(33,61)(34,68)(40,67)(49,52)(51,71)(58,74)(59,65)(63,80)(64,76) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.