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