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