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