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