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