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