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)(17,18,22,23)(19,24,20,27)(21,29,31,25)(26,30,28,32)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,15)(14,16)(17,19)(18,24)(20,22)(21,30)(23,27)(25,26)(28,29)(31,32)(10,14)(11,15)(17,20,22,19)(18,24,23,27)(21,28,31,26)(25,32,29,30)(10,14)(13,16)(17,21)(18,25)(19,26)(20,28)(22,31)(23,29)(24,32)(27,30) involution — undirected(2,6)(5,7)(17,18,22,23)(19,24,20,27)(21,25,31,29)(26,32,28,30)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.