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