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