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