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