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