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