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