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