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