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