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