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