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