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