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