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