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