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