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