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