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