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