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