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