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