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