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