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