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)(11,15)(12,14)(13,16)(18,23)(20,29)(21,24)(25,28)(26,31)(30,32) involution — undirected(2,5)(3,8)(9,11)(10,13)(12,16)(14,15)(17,18,24,31,22,26,21,23)(19,20,25,32,27,30,28,29)(1,3,4,8)(2,6,5,7)(10,14)(11,16)(17,19)(18,20)(21,28)(22,27)(23,29)(24,25)(26,30)(31,32)(2,5)(6,7)(10,14)(11,16)(19,27)(20,30)(25,28)(29,32) involution — undirected(2,5)(6,7)(10,14)(13,15)(17,20,21,29,22,30,24,32)(18,25,23,19,26,28,31,27)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.