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