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