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