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