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