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