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