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