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