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