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