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