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