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