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