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