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