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