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