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