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