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