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