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