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