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