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