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