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