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