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