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