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