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