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)(21,22,26,29)(23,30,33,25)(24,35,27,28)(31,34,36,32)(5,7)(6,11)(8,16)(9,18)(10,17)(12,19)(13,20)(14,15)(21,22)(23,31)(24,28)(25,34)(26,29)(27,35)(30,32)(33,36) involution — undirected(1,2,3,4)(5,8,10,9)(6,12,14,13)(7,16,17,18)(11,19,15,20)(21,23)(22,25)(24,34)(26,33)(27,32)(28,36)(29,30)(31,35)(5,8,10,9)(6,13,14,12)(7,16,17,18)(11,20,15,19)(21,24,26,27)(22,28,29,35)(23,32,33,34)(25,31,30,36)(5,9,10,8)(6,13,14,12)(7,16,17,18)(11,19,15,20)(21,25)(22,23)(24,31)(26,30)(27,36)(28,32)(29,33)(34,35)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.