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