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