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