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