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