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