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