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