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