One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,10,15,11,16,12,17)(7,18,21,31,23,33,22,13)(8,24,9,28,26,14,27,32)(19,30,35,34,20,36,25,29)(1,2)(3,4)(5,7,12,21,11,23,10,22)(6,13,17,18,16,31,15,33)(8,25,27,19,26,35,9,20)(14,30,28,34,24,36,32,29)(2,4)(5,8,10,9,11,26,12,27)(6,14,15,32,16,24,17,28)(7,19,21,35,23,20,22,25)(13,29,18,30,31,34,33,36)(5,9,10,26,11,27,12,8)(6,14,17,28,16,24,15,32)(7,20,22,35,23,19,21,25)(13,30,18,34,31,36,33,29)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.