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