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