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