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