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