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