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