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