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