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