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