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