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