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