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