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