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