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