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