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