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