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