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