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