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