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