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