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