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