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