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)(23,33)(24,34)(25,35)(26,30)(27,31)(28,29)(32,36) involution — undirected(1,2)(3,4)(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,23)(22,24)(25,36)(26,28)(27,34)(29,32)(30,35)(31,33) involution — undirected(2,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,24,26,29,27,33,36,35)(22,28,32,34,31,25,30,23)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,25)(22,29)(23,26)(24,30)(27,28)(31,35)(32,33)(34,36)(2,4)(7,17)(11,14)(15,16)(19,20)(21,26,27,36)(22,30,31,32)(23,25,34,28)(24,29,33,35)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.