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