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