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