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