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