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