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