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