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