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