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