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