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