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