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)(23,30)(24,33)(25,31)(26,28)(27,35)(29,32)(34,36) involution — undirected(1,2)(3,4)(5,7,9,15)(6,10,12,13)(8,14,16,20)(11,17,18,19)(22,28)(29,36)(30,33)(31,35)(2,4)(5,8,9,16)(6,11,12,18)(7,14,15,20)(10,17,13,19)(21,23,26,24)(22,29,28,36)(25,32,27,34)(30,31,33,35)(6,12)(10,13)(11,18)(17,19)(21,24,26,23)(22,30,28,33)(25,32,27,34)(29,31,36,35)(2,4)(7,15)(10,13)(14,20)(17,19)(21,25,26,27)(22,31,28,35)(23,32,24,34)(29,33,36,30)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.