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