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