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