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