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