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