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