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