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