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