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