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