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