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