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