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