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