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