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