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