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