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