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