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)(11,13)(12,14)(15,16)(17,18,20,25,21,26,24,31)(19,23,29,32,28,27,30,22)(1,3,4,8)(2,5,6,7)(9,10)(11,15)(12,14)(13,16)(17,19,21,28)(18,22,26,32)(20,30,24,29)(23,25,27,31)(2,6)(5,7)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,29)(21,28)(22,31)(24,30)(25,32)(26,27)(3,8)(5,7)(11,16)(13,15)(17,18,24,31,21,26,20,25)(19,27,30,32,28,23,29,22)(10,14)(13,15)(19,28)(22,32)(23,27)(29,30) involution — undirectedA 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.