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