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