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