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