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