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