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