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