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