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)(21,22,27,32,25,30,26,31)(23,33,35,36,24,28,34,29)(6,9)(10,12)(13,15,16,19)(14,17,18,20)(21,23,27,35,25,24,26,34)(22,28,32,29,30,33,31,36)(7,11)(10,12)(14,18)(17,20)(21,24)(22,29)(23,25)(26,34)(27,35)(28,32)(30,36)(31,33) involution — undirected(2,4)(5,7,8,11)(6,10,9,12)(22,30)(23,24)(31,32)(34,35)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.