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