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