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