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