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