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