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