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