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