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