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