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