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