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