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