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