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