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