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