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