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