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