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