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