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