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