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