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