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