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