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