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