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