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