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