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