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