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)(15,24)(16,21)(17,22)(18,23)(19,20)(25,27)(26,28) involution — undirected(5,6)(7,11)(8,12)(9,10)(13,15,19,23)(14,18,20,24)(16,17,25,28)(21,26,27,22)(2,4)(5,7,9,8)(6,11,10,12)(14,20)(15,23)(16,25)(22,26)(1,2)(3,4)(5,8,9,7)(6,12,10,11)(13,16,19,25)(14,21,20,27)(15,17,23,28)(18,26,24,22)(13,17)(14,22)(15,25)(16,23)(18,21)(19,28)(20,26)(24,27) involution — undirected(13,18)(14,23)(15,20)(16,26)(17,27)(19,24)(21,28)(22,25) 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.