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