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