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