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