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