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