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)(23,30)(24,34)(25,28)(26,29)(27,33)(31,35)(32,36)(1,2,4,3)(5,7,8,15)(6,10,12,14)(9,16,17,18)(11,19,13,20)(21,23)(22,27)(24,32)(25,33)(26,31)(28,30)(29,36)(34,35)(6,11)(9,17)(10,19)(12,13)(14,20)(16,18)(22,28)(23,31)(24,26)(27,35)(30,36)(32,33) involution — undirected(1,3,4,2)(6,12)(7,15)(11,13)(16,18)(21,24,25,26)(22,29,28,34)(23,32,33,31)(27,36,30,35)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.