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