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