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