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