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