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