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