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