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