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