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