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