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)(14,17)(15,16)(21,22,26,23)(24,29,31,27)(25,28,33,30)(32,35,36,34)(8,12)(10,11)(13,14)(15,19)(16,20)(17,18)(22,23)(24,31)(28,30)(32,36) involution — undirected(6,7)(10,11)(13,15,18,16)(14,19,17,20)(21,23,26,22)(24,27,31,29)(25,28,33,30)(32,35,36,34)(1,2,3,4)(5,7,9,6)(8,11,12,10)(13,16,18,15)(14,19,17,20)(21,24,26,31)(22,27,23,29)(25,32,33,36)(28,34,30,35)(5,8)(6,10)(7,11)(9,12)(13,17,18,14)(15,19,16,20)(21,25)(22,28)(23,30)(24,32)(26,33)(27,34)(29,35)(31,36)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.