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