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