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