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