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