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