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