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