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