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