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