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