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