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