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