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