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