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