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