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