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