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