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