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