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