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