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