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