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