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