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)(17,18,22,20)(19,25,27,23)(21,28,30,24)(26,31,29,32)(3,8)(6,7)(11,15)(13,16)(18,20)(23,25)(24,28)(31,32) involution — undirected(1,3,5,8)(2,6,4,7)(9,10)(11,13)(12,14)(15,16)(17,19,22,27)(18,23,20,25)(21,29,30,26)(24,32,28,31)(3,8)(6,7)(17,19)(18,23)(20,25)(21,26)(22,27)(24,31)(28,32)(29,30) involution — undirected(1,3)(2,7)(4,6)(5,8)(9,11)(10,13)(12,15)(14,16)(17,20,22,18)(19,23,27,25)(21,28,30,24)(26,31,29,32)(1,4,5,2)(3,6,8,7)(9,10)(11,13)(12,14)(15,16)(17,21,22,30)(18,24,20,28)(19,26,27,29)(23,31,25,32)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.