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