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