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