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