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