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