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