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