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