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