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