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