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