One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,14)(13,16)(17,18)(19,29)(20,34)(21,26)(22,41)(23,43)(24,31)(25,37)(27,42)(28,40)(30,54)(32,61)(33,46)(35,50)(36,64)(38,71)(39,47)(44,73)(45,55)(48,68)(49,67)(51,57)(52,62)(53,60)(56,63)(58,80)(59,72)(65,70)(66,69)(74,79)(75,77)(76,78) involution — undirected(1,3,5,11)(2,6,8,9)(4,12,13,10)(7,15,16,14)(17,19,21,31)(18,24,26,29)(20,30,36,56)(22,32,39,59)(23,33,40,60)(25,44,48,51)(27,45,50,52)(28,46,43,53)(34,63,64,54)(35,55,42,62)(37,57,68,73)(38,58,69,78)(41,72,47,61)(49,74,65,75)(66,80,71,76)(67,77,70,79)(17,20,35,67,23,38,22,37,21,36,42,70,40,69,39,68)(18,25,47,71,28,49,27,34,26,48,41,66,43,65,50,64)(19,30,55,77,33,58,32,57,31,56,62,79,60,78,59,73)(24,44,61,76,46,74,45,63,29,51,72,80,53,75,52,54)(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(19,31)(24,29)(30,56)(32,59)(33,60)(44,51)(45,52)(46,53)(54,63)(55,62)(57,73)(58,78)(61,72)(74,75)(76,80)(77,79)(2,8)(6,9)(7,16)(14,15)(18,26)(19,31)(25,48)(27,50)(28,43)(30,56)(32,59)(33,60)(34,64)(41,47)(49,65)(55,62)(57,73)(58,78)(66,71)(77,79) 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.