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