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