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