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