One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,10,16,11,17,35,51,12,18,36,52,20,39,9,15)(7,19,24,44,25,49,22,53,26,41,33,13,37,42,23,43)(8,27,30,48,31,50,29,54,32,45,34,14,38,46,28,47)(21,56,58,66,59,67,57,68,60,40,61,55,62,65,63,64)(1,2)(3,4)(5,7,20,25,12,26,11,37)(6,13,39,43,18,44,17,53)(8,21,31,62,32,60,38,59)(9,33,36,23,35,24,10,22)(14,40,47,67,48,56,54,65)(15,49,52,41,51,42,16,19)(27,55,50,68,45,66,46,64)(28,61,30,57,29,58,34,63)(2,4)(5,8,20,31,12,32,11,38)(6,14,39,47,18,48,17,54)(7,21,25,62,26,60,37,59)(9,34,36,28,35,30,10,29)(13,40,43,67,44,56,53,65)(15,50,52,45,51,46,16,27)(19,55,49,68,41,66,42,64)(22,58,33,63,23,61,24,57)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.