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