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