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