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