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