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