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