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