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