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