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