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