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