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