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