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