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