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