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