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