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)(21,22,25,29)(23,26,31,35)(24,27,32,28)(30,33,36,34)(6,9)(10,12)(13,14,16,18)(15,19,20,17)(21,23,25,31)(22,26,29,35)(24,30,32,36)(27,33,28,34)(5,7)(6,10)(8,11)(9,12)(13,15,16,20)(14,17,18,19)(22,27)(24,32)(26,33)(28,29)(30,36)(34,35)(2,4)(7,11)(10,12) 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.