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