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