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