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