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