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