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