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