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