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