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