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