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