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