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