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