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