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