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