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